But the real cost is from Air Force One. It takes over $210,000 per hour to operate the plane, and the Hawaii trip took 36.9 hours of flight. That adds up to more than $7.7 million dollars.

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It's hard to tell for sure how Obama's vacation compares to the costs of others presidents' vacations. We can compare the amount of time spent on vacations among presidents, though. (Video via The White House)

As of December 2014, Obama had taken 161 vacation days. George W. Bush had taken 405, Bill Clinton had taken 174 and Ronald Reagan had 390.